TY - JOUR
T1 - Surface soil moisture memory using stored precipitation fraction in the Korean peninsula
AU - Kim, Kiyoung
AU - Lee, Seulchan
AU - Lee, Yongjun
AU - Yeon, Minho
AU - Lee, Giha
AU - Choi, Minha
N1 - Publisher Copyright:
© 2022 Korea Water Resources Association.
PY - 2022/2
Y1 - 2022/2
N2 - The concept of soil moisture memory was used as a method for quantifying the function of soil to control water flow, which evaluates the average residence time of precipitation. In order to characterize the soil moisture memory, a new measurement index called stored precipitation fraction (FP(f)) was used by tracking the increments in soil moisture by the precipitation event. In this study, the temporal and spatial distribution of soil moisture memory was evaluated along with the slope and soil characteristics of the surface (0~5 cm) soil by using satellite- and model-based precipitation and soil moisture in the Korean peninsula, from 2019 to 2020. The spatial deviation of the soil moisture memory was large as the stored precipitation fraction in the soil decreased preferentially along the mountain range at the beginning (after 3 hours), and the deviation decreased overall after 24 hours. The stored precipitation fraction in the soil clearly decreased as the slope increased, and the effect of drainage of water in the soil according to the composition ratio of the soil particle size was also shown. In addition, average soil moisture contributed to the increase and decrease of hydraulic conductivity, and the rate of rainfall transfer to the depths affected the stored precipitation fraction. It is expected that the results of this study will greatly contribute in clarifying the relationship between soil moisture memory and surface characteristics (slope, soil characteristics) and understanding spatio-temporal variation of soil moisture.
AB - The concept of soil moisture memory was used as a method for quantifying the function of soil to control water flow, which evaluates the average residence time of precipitation. In order to characterize the soil moisture memory, a new measurement index called stored precipitation fraction (FP(f)) was used by tracking the increments in soil moisture by the precipitation event. In this study, the temporal and spatial distribution of soil moisture memory was evaluated along with the slope and soil characteristics of the surface (0~5 cm) soil by using satellite- and model-based precipitation and soil moisture in the Korean peninsula, from 2019 to 2020. The spatial deviation of the soil moisture memory was large as the stored precipitation fraction in the soil decreased preferentially along the mountain range at the beginning (after 3 hours), and the deviation decreased overall after 24 hours. The stored precipitation fraction in the soil clearly decreased as the slope increased, and the effect of drainage of water in the soil according to the composition ratio of the soil particle size was also shown. In addition, average soil moisture contributed to the increase and decrease of hydraulic conductivity, and the rate of rainfall transfer to the depths affected the stored precipitation fraction. It is expected that the results of this study will greatly contribute in clarifying the relationship between soil moisture memory and surface characteristics (slope, soil characteristics) and understanding spatio-temporal variation of soil moisture.
KW - Precipitation
KW - Soil moisture
KW - Soil moisture memory
KW - Stored precipitation fraction
UR - http://www.scopus.com/inward/record.url?scp=85159373012&partnerID=8YFLogxK
U2 - 10.3741/JKWRA.2022.55.2.111
DO - 10.3741/JKWRA.2022.55.2.111
M3 - Article
AN - SCOPUS:85159373012
SN - 2799-8746
VL - 55
SP - 111
EP - 120
JO - Journal of Korea Water Resources Association
JF - Journal of Korea Water Resources Association
IS - 2
ER -